Seljord is a municipality in Telemark county, Norway. It is part of the traditional region of Vest-Telemark. The administrative centre of the municipality is the village of Seljord. The parish of Siljord was established as a municipality on 1 January 1838 (see formannskapsdistrikt).
Seljord is famous for its sea serpent, Selma, who allegedly lives in Lake Seljord (Seljordsvatnet).
The yearly Dyrsku'n market, held since 1866, attracts 60-80,000 visitors each year.
The municipality (originally the parish) is named after the old Seljord farm (Old Norse: Seljugerði), since the first church was built there. The first element is the genitive case of selja which means "sallow-tree" or "willow" and the last element is gerði which means "field". Prior to 1889, the name was written "Silgjord" or "Sillejord".2
The coat-of-arms is from modern times. They were granted on 15 September 1989. The arms show the sea serpent Selma in a gold-color on a red background.3